Anti-rotation device and anti-rotation structure for a pipe and a connector

Abstract

Anti-rotation device for a pipe and a connector has a pipe connecting portion and a connector connecting portion constructed integrally on the pipe connecting portion. The anti-rotation device is mounted on the pipe and the connector while the pipe connecting portion clips a straight tubular inserting side portion of the pipe in anti-rotating relation and the connector connecting portion is connected to the connector in anti-rotating relation. Thereby the pipe is connected to the connector in anti-rotating relation.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to an anti-rotation device and anti-rotation structure for a pipe and a connector to restrain or prevent a connector, for example, which is adapted for assembly in a gasoline fuel piping of an automobile, from relatively rotating with respect to a pipe which is inserted in and connected to the connector.[0002]In a gasoline fuel piping for an automobile, a connector is used for connecting a pipe and a resin tube as a mating member. For example, the connector comprises a tubular connector housing and a retainer. The connector housing is formed with a tube connecting portion on one axial side and a retainer holding portion on the other axial end of the connector housing. The retainer is received or held by the retainer holding portion. In this structure, a resin tube is fitted to the tube connecting portion, the pipe is inserted in the connector housing through an opening of an opposite axial end of the connector housing or...

AI Technical Summary

Benefits of technology

[0023]Or, the pipe cap portion may be constructed not to rotate with respect to the inserting side portion of the pipe by engaging circumferentially with a stay formed on the pipe or the inserting side portion so as to project outwardly. Here, the pipe can be constructed in simple operation such that a stay is fixed on an outer peripheral surface of the pipe, for example, by welding. It contributes to the small and compact sized pipe connecting portion that an engagement structure between the pipe cap portion and the stay formed on the pipe is adapted. Then the anti-rotation device with such configuration can be connected while verifying visually engagement of the pipe cap portion and the stay.

[0024]In a preferred configuration, if the pipe is insufficiently inserted in the connector housing, the pipe cap portion cannot be fitted on the inserting side portion due to interference with the pipe, for example, with the annular projection or the stay formed on an outer periphery of the inserting side portion of the pipe. This configuration allows an operator to easily verify or find incomplete connection between the pipe and the connector, or a half-fitting relation of the pipe with respect to the connector, and prevents that piping system is subject to operation with the pipe and the connector in half-fitting relation. The connector cap portion and the pipe cap portion fit, for example, on an outer side of an assembled unit of the pipe and the connector. Therefore, when the pipe cap portion cannot fit on the inserting side portion, there is little fear that an operator cannot judge whether the cause is that the pipe and the connector are in half-fitting relation or any other reason, for example, a stay is not located so as to circumferentially correspond to a cutaway.

[0025]An anti-rotation device for a pipe and a connector according to the present invention may be adapted in order to restra...

Problems solved by technology

Meanwhile, for example, when a resin tube connected to a connector is continued to a gasoline engine of an automobile, the connector or a connector housing constantly rotates at a small angle with respect to a pipe by vibration transmitted from the gasoline engine to the connector via the resin tube, and thereby a sealing member which is disposed between the connector or the connector housing and the pipe is worn and a sealing property is deteriorated between the connector...

Images